4x DVD+R/RW Roundup -
Page 4

CD Error Correction
Tests

Mitsumi DW-7801

In the following tests we examined the error correction capabilities of
the Mitsumi DW-7801TE, when reading an artificially damaged CD-R. For the
test we used the Almedio ABEX pressed discs, and the EAC test disc.

- EAC CD-R Test Disc

The EAC test disc is always hard to read for all the drives we have tested.
The Mitsumi drive reported many errors and some of them were muted. The
number of skipped samples was also high resulting to an overall score of 52.3
points out of 100.

Errors total

Num: 116273155

Errors (Loudness) dB(A)

Num: 608319

Avg: -30.6 dB(A)

Max: -7.2 dB(A)

Error Muting Samples

Num: 84361

Avg: 1.2 Samples

Max: 622

Skips Samples

Num: 433

Avg: 37.9 Samples

Max: 2934 Samples

C2 accuracy

50.5%

Total Test Result

52.3 points (of 100.0 maximum)

The C2 accuracy reported is only 50.5%. We cannot come up with safe conclusions
by this test only, but the first impression is that the Mitsumi DW-7801TE cannot
retrieve C2 error information accurately.

- ABEX TCD-721R

Errors total

Num: 916017

Errors (Loudness) dB(A)

Num: 48471

Avg: -73.1 dB(A)

Max: -6.7 dB(A)

Error Muting Samples

Num: 3061

Avg: 1.1 Samples

Max: 40 Samples

Skips Samples

Num: 16

Avg: 6.0 Samples

Max: 6 Samples

C2 accuracy

99.1 %

Total Test Result

67.7 points (of 100.0 maximum)

The score for the Mitsumi drive is 67.7, still an average performance. The
total errors were less than in the previous test, as it was expected.
The average level of the Loudness errors is -73.1dB(A).

This time the C2 accuracy reported is higher than in the previous test, but
it is away from 100%. The ABEX 721R is a pressed test disc and easy to read,
compared to the EAC disc
in the
previous
test.

- ABEX TCD-726

The total amount of errors is smaller in the case of the TCD-726 disc.
The scratches on the disc is not as heavy as in the TCD-721, and the rest
defects and fingerprints
seem not to produce many errors while reading. The Loudness errors were only
20 and the average level was -48.4dB(A), which is an acceptable level. Only
2 samples were muted, and their average length was low. The score for this
test is the best we had for the Mitsumi drive. (88.2 points).

Errors total

Num: 6

Errors (Loudness) dB(A)

Num: 20

Avg: -48.4 dB(A)

Max: -31.1 dB(A)

Error Muting Samples

Num: 0

Avg: 0 Samples

Max: 0 Samples

Skips Samples

Num: 2

Avg: 6.0 Samples

Max: 6 Samples

C2 accuracy

100.0 %

Total Test Result

88.2 points (of 100.0 maximum)

- Conclusion

Test Disc

Reading Speed

Score

EAC CD-R

Max

52.3

ABEX TCD-721R

67.7

ABEX TCD-726

88.2

Average Score

69.4

Test Disc

C2 Accuracy

ABEX TCD-721R

99.1%

ABEX TCD-726

100%

The Mitsumi DW-7801TE gets an average score of 69.4 points
out of 100 at our CD
error correction tests. The drive can be a good reader with not heavily defected
discs, as we saw in the ABEX-726 test, but cannot correct adequately severe
errors coming from wide scratches.

On the other hand, retrieving of C2 information is not 100% accurate.

CDSpeed Advanced DAE quality test

- ABEX 721R

According to the Nero test with the ABEX TCD-721R, the quality
score for Mitsumi DW-7801TE is 68.2 points, while the C2 accuracy
is rather low (77.65%). The main reason for this result is the increased amount
of compare errors, and the 957 sync errors that were reported.